Custom Edges

Svelte Flow comes with four different edge types - default (bezier), straight, step and smoothstep. It’s also possible to create a custom edge, if you need a special edge routing or controls at the edge. In this example we are demonstrating how to implement an edge with a button, a bi-directional edge, a self connecting edge. In all examples we are using the BaseEdge component as a helper.


<script lang="ts">
  import {
    SvelteFlow,
    Background,
    ConnectionMode,
    Controls,
    type Node,
    type Edge,
  } from '@xyflow/svelte';
 
  import '@xyflow/svelte/dist/style.css';
 
  import { initialNodes, initialEdges } from './nodes-and-edges';
 
  import ButtonEdge from './ButtonEdge.svelte';
  import BiDirectionalEdge from './BiDirectionalEdge.svelte';
  import BiDirectionalNode from './BiDirectionalNode.svelte';
  import SelfConnectingEdge from './SelfConnectingEdge.svelte';
 
  let nodes = $state.raw<Node[]>(initialNodes);
  let edges = $state.raw<Edge[]>(initialEdges);
 
  const nodeTypes = {
    bidirectional: BiDirectionalNode,
  };
 
  const edgeTypes = {
    buttonedge: ButtonEdge,
    bidirectional: BiDirectionalEdge,
    selfconnecting: SelfConnectingEdge,
  };
</script>
 
<SvelteFlow
  bind:nodes
  {nodeTypes}
  bind:edges
  {edgeTypes}
  connectionMode={ConnectionMode.Loose}
  fitView
>
  <Controls />
  <Background />
</SvelteFlow>